Adjustable jack.



A. D. eoonwm.

ADJUSTABLE JACK.

APPLICATION FIED FEB.13,19I7.

1 ,2? 1 $97, Patented July 2, 1918.

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'ALFRED D. GOODWIN, OF RIIPON, CALIFORNIA.

. ADJUSTABLE JACK.

Specification of Letters Patent.

Patented July 2, 1918.

Application filed February 13, 1917. Serial No. 148,329.

To all whom it may concern:

Be it known that I, ALFRED D. GooDwIN, a citizen of the United States, residing at Ripon, in the county of San Joaquin, State of California, have invented certain new and useful Improvements in Adjustable Jacks; and I do declare the following to be a full, clear, and exact description of the same, reference being had to the accompanymg drawings, and to the characters of reference marked thereon which form a part of this application.

This invention relates to improvements in lifting jacks and particularly to that type used for lifting vehicles of all kinds, especially motor vehicles. The object of the invention is to produce a wheel jack wh ch may be readily adjusted to fit various different makes of vehicles. In conjunction with the adjustable feature I provide a means whereby the adjustable lifting bar is automatically locked in position by the weight of the vehicle as soon as the liftmg lever is brought into operation.

A further object of the invention is toproduce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views.

Figure 1 is a side elevation of the complete device.

Fig. 2 shows a fragmentary portion of the lifting lever showing the slidable carrier thereon in section and disclosing the locking means arranged within the carrier.

Referring now more particularly to the characters of reference on the drawings the numeral 1 designates the lifting lever provided with a handle 2 and mounted at its opposite end on wheels or rollers 3.

Slidable along the length of the lever 1 is the carrier 4, pivotally connected with which is a push rod 5. This push rod extends along the top of the lever 1 and projects through a guide 6 and is provided in its opposite end with a small operating handle 7.

Formed in the sides of the carrier 4 are two small elongated slots 8, slidably mounted in which is a pin 9. Swiveled on the pin 9 is a lifting bar 10 which terminates at its upper end in the engaging jaw 11. supporting link bar 12 is swlveled on the shaft 13 of the wheels 3 and likewise on a small pin 14 on the bar 10.

The upper edge of the bar 10 at its lower end is provided with a projecting lug 15 having its corner as at a, curved for a purpose which will presently appear. The lower corner of the bar 10 is also curved at 0 to allow of a freedom of movement in the operation hereinafter set forth.

When it is desired to use the jack the same is wheeled-underneath the vehicle and the jaw 11 is lined up with some part of the body of the vehicle for engagement therewith. During this operation the lever 1 is of course, held above the ground level. The push rod 5 is then utilized to advance the carrier 4 along the length of the lever 1. This action causes the lifting bar 10 to move upwardly until it engages the vehicle. The lever 1 is then moved on its fulcrum (namely the wheels 3) which causes the lifting bar 10 to lift the vehicle. When the lever is completely pushed against the ground the fulcrum is sufficiently past center to cause the vehicle to be held rigidly in its raised position. This position could not be maintained however unless I provided a lock for the bar 10. This lock I maintain by means of the following structure namely: As

the weight of the vehicle comes against the bar 10 it causes the pin 9 to slide in the slots 8 which allows the bar 10 likewise a slight sliding movement. This action brings the corner a of the lug 15 into engagement with the back 6 of a dog 16 pivoted in the carrier 4. This action moves such dog 16 on its pivoted pin 16 and causes its lower corner d to move into frictional contact with the top of the lever 1. This engagement will hold the carrier 4 from sliding on the lever 1 and hence will hold the bar 10 in rigid engagement with the vehicle as long as the weight of the vehicle is against it. WVhen the weight of the vehicle is released however, this loosens all of the parts and this frictional engagement may then be readily re leased and the carrier moved to disengage the jaw 11 from the vehicle.

From the foregoing description it will be seen that by means of the sliding carrier 4 the position of the jaw 11 may be varied so that it can {it different vehicles at different points of contact as may be found desirable.

When such adjustment is accomplished the parts are then automatically locked in position by means of the locking operation above described.

Likewise from such description it will be readily seen that I have produced such a device as substantially fulfils the object of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device still in practice such deviations from such detail maybe resorted to as do not form a departure from the spirit of the invention as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. An adjustable jack comprising a lever adapted to lie in a substantially horizontal position, when holding the lifted object, a carrier slidable along the length of the lever, a lifting bar pivotally mounted in the carrier, alink pivoted to the bar and the lever whereby when the carrier is moved it will alter the relative distance between the outer end of the lifting bar and the lever.

2. An adjustable jack comprising a lever adapted to lie in a substantially horizontal position when holding the lifted object, a

carrier slidable along the length of the lever, a lifting bar pivotally mounted in the carrier, a link pivoted to the bar and the lever whereby'when the carrier is moved it will alter the relative distance between the outer end of the lifting bar and the lever, and means for fixing the carrier stationary at any point on the lever.

3. An adjustable jack comprising, a lever, a carrier slidable on the lever, a lifting bar pivoted in the carrier and having a longitudinal movement therein, a dog pivoted in the carrier, and arranged so that when engaged by the lifting bar it will frictionally engage the lever and lock the carrier against movement thereon, the bar being adapted to move into engagement with said dog when a weightis supported by such bar. 4:- An adjustable j ack comprising a lever, a carrier slidable on the lever, a lifting bar arranged for pivotal andsliding movement in the carrier, a lug on the bar, a pivoted dog in the carrier such dog being engageable by the lug when the bar slides in the carrier whereby the dog will frictionally engage the lever and lock the carrier against movement on such lever.

In testimony whereof I affix my signature.-

ALFRED D. GOODWIN.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

